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RE: Drill Stem Distance

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Neelabh Sharma

Usually there are Top & Bottom proximity sensors coupled with 2 nos. of ‘Drum in’ sensors…typical of Flowserve…….
Some also include a variation in which there is a drum washing limit sensor also incorporated which is higher thatn the ‘Drum-In’ signal
Position of the drill stem is determined by the rpm of the Wire-rope hoist drum having measured grooves whereby rpm is converted to distance covered and therby the drill stem position…
Bent drill stems are one-off problems…this should not ideally be the basis to change your system…look out for the reasons of Bent drill stems…get drill stems replaced
I hope i have answered your query….if not please elaborate some more…

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